Install XFCE & XRDP

sudo apt-get -y install xrdp xfce4

Fix Policy Kit to Avoid Color Manager Error Message

cat << EOF | sudo tee /etc/polkit-1/localauthority.conf.d/02-allow-colord.conf
polkit.addRule(function(action, subject) {
    if ((action.id == "org.freedesktop.color-manager.create-device" || action.id == "org.freedesktop.color-manager.create-profile" || action.id == "org.freedesktop.color-manager.delete-device" || action.id == "org.freedesktop.color-manager.delete-profile" || action.id == "org.freedesktop.color-manager.modify-device" || action.id == "org.freedesktop.color-manager.modify-profile") && subject.isInGroup("{group}")) {
       return polkit.Result.YES;
    }
});
EOF

Create default file .xsession for new users

echo xfce4-session | sudo tee /etc/skel/.xsession

Do not start GUI on console

sudo systemctl set-default multi-user.target

Reboot to provide clean start

sudo reboot